Coupling for hose



Sept. 30, 1947. J. N. wou-'RAM COUPLING FOR HOSE 2 Sheets-Sheet 1 FiledJan. 8, 1945 Sept, 3o, 1947.

J. N. woLFRAM coUPLmG Fon nosE Filed Jan, s,v 1945 2 Sheets-Shag't 2Patented Sept. 30, 1947 NT oFricE COUPLING FOR HOSE John N. Wolfram,Cleveland, Ohio, assignor to The Parker Appliance Company, Cleveland,hio, a corporation of Ohio Application January 8, 1945, Serial No.571,818

3 Claims. l

The invention relates to new and usefulv improvements in a coupling fora hose and more particularly a hose which has a rubber inner section andan outer protective cover.

An object of the invention is to provide a coupling wherein the hose issecured to a body member by devicesv which separately grip the rubbersection and the protective cover.

A further object of the invention. is toY provide a coupling of theabove type with means for limiting the clamping pressure againstl therubber section without disturbing the grip of the coupling upon theprotective cover.

In the drawings- Figure l is a view partly in side elevation and partlyin section showing a coupling embodying the improvements with the nutand ring placed on the hose and the clamping sleeve with its initialinsertion between the protective cover and the rubber section;

Figure 2 is a view similar to Figure 1 but showing the sleevefully'inserted between the rubber section and the protective cover andthe ring as linger-forced onto the protective cover and holding the sameagainst the sleeve;

Figure 3 is a view showing the hose as forced onto the nipple of thebody member by a finger tightening ofthe nut;

Figure 4 is a sectional view showing the coupling completely closed andgripping'separately the rubber section and the protective cover with alimited clamping pressure on the rubber section.

The coupling includes 'a body member i which may be attached to anysuitable part. Said body member has a bore 2 therethrough which issubstantiallythe same as the inner diameter of the hose which is to bejoined to the body member. Said body member has a threaded section 3with which a nut d makes-connection. The nut 4 has a flange 5 at itsouter end surrounding an opening B through which the hose extends intothe coupling.

'Ihe body member is shaped so as to provide a nipple 'l which is of thesame bore as the body member. The outer face of the nipple l is taperedas indicated at 8 to form a tapered seat against which the rubbersection of the hose may be clamped. The body member at the inner end ofthe nipple 'l is provided with a shoulder 9 lying in a. planesubstantially at right angles to the axis of the coupling. The hoseincludes a. rubber section it and a protective cover section il. Thisprotective cover section 'Il may be of any Vsuitable material, butpreferably it is formed of glass braid bers impregnated with a flexible(ci tss-.72)

plastic. It may, however, be made of cotton braid tapered on a steeperangle and this outer face' serves as a seat against which the protectivel0 cover of the hose is clamped. i

Located within lthe nut is a clamping ring l5 which is engaged by theflange 5 of the nut. The inner face of this clamping ring is tapered toconform substantially to the taper of the face I4 of the sleeve l2, andcooperates therewith in the clampingv of the protective cover. vTheouter ta-4 pered face of the sleeve, at its inner end, is more abruptlytapered as indicated at I6 and the inner end of the ring l5 is likewisemore abruptly tapered to conform to the taper I6 of the sleeve.

The inner face I3 of the sleeve I2 and the outer face it thereofintersect at il in what might be referred to as a knife edge. This edgeis circular and is of a diameter substantially conforming to the outerdiameter of the rubber section of the tube'.

When it is desired to attach a hose to the coupling the nut and the ringare slipped 'onto the hose. Then the knife edge il of the sleeve 3o l2is inserted between the protective cover and the rubber section asindicated in Figure .1. The sleeve is forced in between the protectivecover and the rubber section until .the rubber section is close to theinner end of the sleeve. The ring l5 is then forced onto the sleeve andwill grip the protective cover, as shown in Figure 2. The hose with theparts thus assembled thereon is then forced onto the nipple, the nippleextending into the rubber section of the hose. The nut is 40 connectedto the body mem-ber and is turned by hand substantially to the positionshown'in Figure 3. When the parts are positioned as shown in thisfigure, it will be noted that the sleeve clamps the rubber section`against the nipple and the ring clamps the protective cover against thesleeve. That is to say, there are independent clamping devices for therubber section and for the protective cover.

When .the nut is turned further onto the body member the sleeve movingendwise along the nipple will compress ythe rubber section until the endi8 of the sleeve makes contact with the shoulder 9. The sleeve cannot bemoved further relative to the nipple and therefore the clamping pressureagainst the rubber section is limited by 3 this shoulder. In view ofthis limiting of the clamping pressure against the rubber section, all

danger iseliminated of damaging the rubber section and reducing theeiective grip of the coupling on the hose.

When the sleeve contacts with the shoulder 9,

further pressure oi the nut against the ring I' 1 will produce aclamping pressure against the protective cover which is entirelyindependent of l the clamping pressure of the sleeve againstthe rubbersection. The reason for tapering or curvd ing the inner portion of theseat on the sleeve engaged by the protective cover is to limit theextent of clamping pressure of the ring against the protective cover.This limiting of the clamping pressure of the ring against theprotective ing a body member having the inner end there-4 of shaped toprovide a relatively long-tapered nipple adapted to extend into therubber section and form a seat against which it may be clamped. a nuthaving a threaded engagement with said body member and having a clampingflange, a

cover will also cause the end of the cover to be very ilrmly grippedbetween the ring and the sleeve.

From the above it will be noted that a coupling has been providedwherein the rubber section and t e protective cover are separatelygripped by t e coupling and the clamping pressure of the couplingagainst the rubber section is limited without in any way disturbing theclamping pressure which may be exerted against the cover. Furthermore,there is a limit imposed upon the clamping pressure exerted on theprotective cover. This makes a very eilicient coupling of simpleconstruction, readily assembled, wherein the hose is iirmly connected tothe coupling without the liability of injuring the rubber section of thehose,

By this arrangement the real grip of the coupling on the hose may belimited so as to establish a seal with a slight grip on the rubbersection without any danger of damaging the same. The firm grip of thecoupling on the hose is through the grip of the rigid metal surfacescontacting `with the protective cover. It will be noted that in thetightening of the coupling if the end of the protective cover is pinchedthrough there is still a substantial thickness of cover left unpinchedVwhich will firmly hold the hose in the coupling. The coupling isespecially adapted for high pressure and so as to resist severe pull-outstrains thereon.

It is obvious that minor changes in the details oi construction andarrangement of the parts may be made without departing from the spiritof the -invention as set forth in the appended claims.

I claim:

l. A coupling for 3. nose having an inner rubber section and an outerprotective cover comprising a body member having the inner end thereofshaped to provide a relatively long tapered nipple adapted to extendinto the rubber section and form a seat against which it may be clamped,a nut having a threaded engagement with said body member and having aclamping flange. a sleeve in said nut having its inner faceshaped toconform substantially to the seat on the nipple and cooperatingtherewithto'grip the rubber section, the outer face of said sleeve belngtapered and adapted to form a clamping seat for'the protective cover andairing surrounding said sleeve and having `its inner face shaped so asto conform substantially to the seat for the protective cover andcooperating therewith to -form substantially to the seat for theprotective sleeve in said nut having its inner face shaped t0 conformsubstantially to the seat on the nipple and cooperating therewith togrip the rubber section, the outer face of said sleeve being tapered andadapted to form a clamping seat forthe protective cover, a ringsurrounding said sleeve and having its inner face shaped so as toconcover and cooperating therewith to grip said cover, said nutoperating when turned onto said body member to force said ring intogripping en gagement with the protective cover and to force said sleeveinto gripping engagement with the rubber section, and means for limitingthe clamping pressure of the sleeve against the rubber section.

3. A coupling for a hose having an inner rubber section and an outerprotective cover comprising a body member having the inner end thereofshaped to provide a relatively long tapered nipple adapted to extendinto the rubber section and form a seat against which it may be clamped,a nut having a, threaded engagement with said body member and having aclamping vilange, a sleeve in said nut having its inner face.

shaped to conform substantially to the seat on the nipple andcooperating therewith to grip the rubber section, the outer face of saidsleeve being tapered and adapted to form a, clamping seat for theprotective cover, a, ring surrounding saidA sleeve and having its innerface shaped so as to conform substantially to the seat for theprotective cover and cooperating therewith to grip said cover, said nutoperating when turned onto said body member to force-said ring intogripping engagement with the protective cover and to force said sleeveinto gripping engagement with the rubber section, and a shoulder forlimiting the endwise movement of the sleeve, said shoulder cooperatingwith said nut in the effective clamping of the protective cover betweenthe ring and sleeve.

JOHN N. WOLFRAM. REFERENCES CITED l The following references are ofrecord inthe le of this patent:'

UNITED STATES PATENTS Guarnaschelli Oct. 22, 1940

